Here’s a little squirt of nostalgia into the brains of our (slightly) older readers: it’s an iPad app called Light Pad HD, and it exists to help you view your film slides and negatives by turning your iPad into a light-box. Instead of having to find a brightly lit piece of wall, or a window without distractions behind it, you can just launch this $2 app and drop your film strips on top of the iPad’s screen and use its screen.